Choose the correct alternative.
1
He wouldn't have had an accident if he has/had been more
careful.
2 If she hadn't called the ambulance immediately, it wouldn't
have/had come in time.
3. The film Titanic wouldn't have been so famous if Leonardo
DiCaprio wouldn't have/hadn't been in it.
4 If you'd/would lent me your history book, I would have passed
the test.
5 We would have/have understood the lesson if Mr Crook had
explained it more clearly.

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